Abstract

Hot-carrier based photodetectors are independent on the semiconductor bandgap, thus paving a new paradigm of photovoltaic conversion. Herein, we propose a non-nanostructured and multilayered metal/insulator/transparent conductive oxide/silica/reflector system, and explore in detail the optical response and the electrical transport in the device via the finite-element electromagnetic simulation and the probability-based analytical carrier-transport calculation. Results show that the planar system can function as a planar perfect absorber at the targeted wavelength under the inbuilt cavity resonance with a very high tunability by tailoring the cavity length and the metal thickness. Moreover, a strong asymmetrical absorption is formed in the two electrode layers, yielding strong unidirectional photocurrents and output power densities. This Letter suggests a more simple and feasible way to realize hot-carrier infrared photodetectors.

© 2015 Optical Society of America

Polarization-insensitive hot-electron infrared photodetection by double Schottky junction and multilayer grating

Qiaoping Zhang, Cheng Zhang, Linling Qin, and Xiaofeng Li
Opt. Lett. 43(14) 3325-3328 (2018)

Planar hot-electron photodetection with polarity-switchable photocurrents controlled by the working wavelength

Weijia Shao, Weihao Cui, Junhui Hu, Yongmei Wang, Jian Tang, and Xiaofeng Li
Opt. Express 31(15) 25220-25229 (2023)

Broadband perfect absorber based on one ultrathin layer of refractory metal

Huixu Deng, Zhigang Li, Liliana Stan, Daniel Rosenmann, David Czaplewski, Jie Gao, and Xiaodong Yang
Opt. Lett. 40(11) 2592-2595 (2015)

Nanobowls-assisted broadband absorber for unbiased Si-based infrared photodetection

Luwei Zhou, Cheng Zhang, Liujing Li, Tingting Liu, Ke Li, Shaolong Wu, and Xiaofeng Li
Opt. Express 29(10) 15505-15516 (2021)

Suppression of gap plasmon resonance for high-responsivity metal–insulator–metal near-infrared hot-electron photodetectors

Xiaolong Hu, Fen Li, Hailin Wu, and Wenjie Liu
Opt. Lett. 47(1) 42-45 (2022)